The human immunodeficiency virus (HIV) primarily infects which cells?

a. red blood cells
b. mast cells and basophils
c. B cells and cytotoxic T cells
d. NK cells
e. macrophages, dendritic cells, and helper T cells


e

Biology & Microbiology

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RNA molecules that also act as enzymes are given the name  

A.  ribozymes B.  cofactors C.  coenzymes D.  allosteric enzymes

Biology & Microbiology

Sulfur has an atomic number of 16. How many covalent bonds can sulfur form?

A) 1
B) 2
C) 4
D) 0

Biology & Microbiology

The most likely place where an exoenzyme participates in a chemical reaction is

A. within the cell membrane. B. cytoplasm. C. mitochondria. D. outside of the cell. E. lysosomes.

Biology & Microbiology

Chapman showed via careful experiments that male accessory gland proteins are re-sponsible for lower female survival

Imagine that instead of the proteins it was the physical act of mating itself that reduced the longevity of females. The graph below shows Chapman's results for treatment 2. What would you expect the data for the other three treatments to look like if it was on-ly the physical act of mating that had an effect on female longevity? For each treatment use +, –, or = to indicate increased, lowered, or the same survival probability when compared to treatment 2. See figure legend for an explanation of the experimental treatments. A. __ Treatment 1 B. __ Treatment 3 C. __ Treatment 4 What will be an ideal response?

Biology & Microbiology